<template>
  <div>
    <table border="1" width="700" style="border-collapse: collapse">
      <caption>
        购物车
      </caption>
      <thead>
        <tr>
          <th><input type="checkbox" v-model="isAll" /> <span>全选</span></th>
          <th>名称</th>
          <th>价格</th>
          <th>数量</th>
          <th>总价</th>
          <th>操作</th>
        </tr>
      </thead>
      <tbody>
        <tr v-for="(item, index) in goodList" :key="index">
          <th><input type="checkbox" v-model="item.checked" /></th>
          <th>{{ item.name }}</th>
          <th>{{ item.price }}</th>
          <th>
            <button @click="subBtn(index)">-</button>{{ item.num
            }}<button @click="addBtn(index)">+</button>
          </th>
          <th>{{ item.num * item.price }}</th>
          <th><button @click="delBtn(index)">删除</button></th>
        </tr>
      </tbody>
      <tfoot>
        <tr>
          <td>合计:</td>
          <td colspan="5">{{ sum }}</td>
        </tr>
      </tfoot>
    </table>
  </div>
</template>

<script>
import { mapState } from 'vuex'
export default {
  methods: {
    addBtn (index) {
      this.$store.commit('addFn', index)
    },
    subBtn (index) {
      this.$store.commit('subFn', index)
    },
    delBtn (index) {
      this.$store.commit('delFn', index)
    }
  },
  computed: {
    // goodList() {
    //   return this.$store.state.goodList;
    // },
    ...mapState(['goodList']),
    isAll: {
      set (flag) {
        this.goodList.map((item) => (item.checked = flag))
      },
      get () {
        return this.goodList.every((item) => item.checked)
      }
    },
    sum () {
      return this.goodList.reduce((sum, item) => {
        if (item.checked === true) sum += item.num * item.price
        return sum
      }, 0)
    }
  }
}
</script>

<style></style>
